Editing a recurring event fails with "current_event_id: Field required"

When editing a recurring event, saving shows an error: **"current_event_id: Field required"** (displayed near the Save Changes button), and the change doesn't go through. **Where:** Recurring event → edit → Save Changes. **Expected:** Editing a recurring event saves successfully with no error. **Steps to reproduce:** 1. Open a recurring event you host. 2. Make a change and click "Save Changes." 3. The error "current_event_id: Field required" appears and the edit isn't saved.